Picture-projecting apparatus



I 1, RQWHITE. PICTURE PROJECTING APPARATUS.

APPLICATION FILED DEC, I6, 1914.

1,312,374. Patented Aug. 5,1919.

Glikozucq JOSEPH'ROGER WHITE, OF WASHINGTON,-DISTRICT OF COLUMBIA, ASSIG-NOR TO THE GBAPHOSCOPE COMPANY, OF WASHINGTON, DISTRICT OF COLUMBIA, A COBIORA TION OF DELAWARE.

PICTURE-PROJ EGTIN G APPARATUS.

specification of Letters Patent.

Patented Aug. 5, 1919,

To all whom it may concern:

Be it known that I, JOSEPH ROGE R WHI'I'E, a citizen of the United States, residing at Washington, in' the District of Columbia,

have invented certain new and useful Improvements in Picture-Projecting Apparatus, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to projecting pictures by means of arc lights. With the usual alining carbons approximately perpendicular to the projecting line, the currentthe working end of the carbon D and in such position that they intercept practically no rays which it is desirable to have fall upon the condensing lens. F represents any suitable source of current from which circuit is made through a conductor G, the carbon D, the arcs at the gaps, the carbons E, E, and the conductor. branches G, back to the source. In the branches leading from the carbons E, E, respectively, are interposed rheostats H, H. When suitable cur-- rent passes from the source, .two arcs are formed from the carbon D to the carbons E, E, respectively, and obviously rays from the. luminous areas upon the carbon D pass unobstructed to the condensing lens C. The resistances in the-two branches may be unequal within somewhat wide limits without destroying or interfering with the formation of the two arcs.

It is evident that the electrodes are not necessarily carbons in rod form, so, long as light from the luminous areas is not obstructed by any of the three electrodes; and

- this condition being observed, the number of electrodes may be increased.

What I claim is:

1. In. picture projecting apparatus, the combination with suitable lenses, of an are light electrode in the axial line of the lenses, and a plurality of other electrodes coacting with the electrode first mentioned to form a plurality of arcs in parallel and lying outside the paths of rays passing from the luminous area on the first electrode to said lenses,

said electrodes lying in the same plane in position to form on the end of the axial electrode a slngle central crater or luminous spot.

2. In picture projecting apparatus, the

combination with suitable lenses of an are light electrode lying in the axial line of the lenses, a plurality of other electrodes in the same plane diverging from the point where said linemeets the firstment-ioned electrode and in position to coact therewith to form a single central luminous spot on the end of the electrode first mentioned, a source of current, a conductor leading from said source to the first electrode, conductors leading from said other electrodes, respec-' tively, back to the source, and rheostats interposed in the conductors last mentioned,

respectively.

'3. In picture projecting devices, the combination of alined projecting and condensing lenses, of an are light electrode having a point in the axial line of the lenses, and a plurality of divergent companion electrodes in parallel in position to form with the first electrode arcs'diverging from a common central point on the end-of the latter, and all lying outside the path ofrays passing from the'llnninous area of the first mentioned electrode to the condensing lens. ,1!

4. The combination with a suitable are light electrode, of a series of electrodes arranged beyond the end of said electrode, forwardly diverging from the extended axis thereof and in position for forming therewith 'arcs in parallel extending from a common luminous central spot on the end of the electrode first mentioned.

5. The combination with a suitable are light electrode, of a series of electrodes arranged about the electrode first mentioned in position for forming therewith arcs in parallel diverging from a common luminous mentioned, forwardly diverging from the light electrode, of a series of electrodes arranged beyond the end of the electrode first source to the first electrode, conductors leading from the other electrodes, respectively,

back to'said source, and rheostats interposed in the conductors last mentioned, respectively. r

7. The combination with a. suitable are light electrode, of a series of electrodes er mentioned, beyond the end of said electrode, forwardly diverging from the extended axis thereof and in position to form therewith arcs having their ends in the same plane and all diverging from a common central luminous spot on the end of the electrode first mentioned.

In testimony whereof I eflix my signature in presence of two Witnesses.

JOSEPH ROGER WHITE,

Witnesses:

CHAs. F. JENKINS, I JAMEs L. CRAWFORD.

ranged in parallel about the electrode first 

